BR112017016616B1 - Interlayer film for laminated glass, and laminated glass - Google Patents

Abstract

The invention relates to an interlayer film for laminated glass, whereby the manufacturing efficiency of laminated glass can be increased. The interlayer film for a laminated glass belonging to the present invention has a single layer structure or a structure having two or more layers, wherein the interlayer film for a laminated glass is provided with a first layer including a thermoplastic resin, the softening point of the first layer is 60°C or above, the interlayer film having an MD direction and a TD direction, and an entire MD1MAX thermal shrinkage ratio, an MD2MAX thermal shrinkage ratio, and an MD3MAX thermal shrinkage ratio which are thermal shrinkage when a first inner portion, a second inner portion, and a central portion, respectively, of the interlayer film are heated for 20 minutes at 140°C being 45% or less.

Description

TECHNICAL FIELD

[001] The present invention relates to an interlayer film for laminated glass that is used to obtain laminated glass. Furthermore, the present invention relates to laminated glass prepared with the interlayer film for laminated glass.

BACKGROUND TECHNIQUE

[002] Considering that laminated glass generates only a small amount of dispersed glass fragments even when subjected to external impact and broken, laminated glass excels in safety. As such, laminated glass is widely used for automobiles, railway vehicles, aircraft, ships, civil construction and the like. Laminated glass is produced by sandwiching an interlayer film for laminated glass between two sheets of glass.

[003] Examples of the interlayer film for laminated glass include a single layer interlayer film having a one-layer structure and a multilayer interlayer film having a two or more layer structure.

[004] As an example of the interlayer film for laminated glass, the following Patent Document 1 describes a sound insulating layer comprising 100 parts by weight of a polyvinyl acetal resin with a degree of acetalization of 60 to 85% by mol. , 0.001 to 1.0 part by weight of at least one type of metal salt between an alkali metal salt and an alkaline earth metal salt, and a plasticizer in an amount greater than 30 parts by weight. This sound insulation layer can only be used as a single layer interlayer film.

[005] Furthermore, the following Patent Document 1 likewise describes a multi-layer interlayer film in which the sound insulating layer and another layer are layered. Another layer to be layered with the sound-insulating layer includes 100 parts by weight of a polyvinyl acetal resin with a degree of acetalization of 60 to 85% by mol, 0.001 to 1.0 parts by weight of hair. at least one type of metal salt between an alkali metal salt and an alkaline earth metal salt, and a plasticizer in an amount of 30 parts by weight or less.

[006] The following Patent Document 2 describes an interlayer film which is comprised of a polymer layer having a glass transition temperature of 33°C or more.

[007] The following Patent Document 3 describes a resin film based on polyvinyl acetal having a thickness distribution in the width direction of 10% or less and a volatile matter content of 1.0% by mass or less. In this polyvinyl acetal based resin film, when two 5% inner portions of both ends in the width direction of the full width of the film are heated for 30 minutes at 150°C respectively, a value of the thermal shrinkage ratio of a inner portion of 5% greater thermal shrinkage ratio in the flow direction that is parallel to the film and perpendicular to the width direction is defined as the MD1 thermal shrinkage ratio, a value of the thermal shrinkage ratio of the other inner portion of 5% smallest thermal shrinkage ratio in this is defined as the thermal shrinkage ratio MD2, and a value of the thermal shrinkage ratio of a central portion in the flow direction that is parallel to the film and perpendicular to the width direction, obtained at the time of heating of the central portion in the width direction of the film for 30 minutes at 150 °C is defined as the MD3 thermal shrinkage ratio, the entire MD1 thermal shrinkage ratio, the thermal shrinkage ratio MD1 MD2 thermal shrinkage and MD3 thermal shrinkage ratio have 3 to 20%. Related Art Documents Patent Documents

[008] Patent Document 1 : JP 2007-070200 A

[009] Patent Document 2: US 2013/0236711 A1

[0010] Patent Document 3 : WO 2012/133668 A1

SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] For example, laminated glass is used as a windshield of a vehicle. For example, in recent years, in order to improve the fuel consumption of a vehicle, a technique for reducing a glass plate used for laminated glass has been studied. However, when a glass plate used for laminated glass is reduced, there is a problem that the rigidity of laminated glass is decreased.

[0012] In addition, as a method to increase the rigidity of laminated glass, a method of physically hardening an interlayer film was studied.

[0013] In general, two sheets of glass plates and an interlayer film interposed between them, which are laminated so that the interlayer film portions (to be cut) are protruded from the end of the glass plate to form a laminate, they are bonded together under a high temperature environment (autoclave (140 °C, 20 minutes)) and the portions of the interlayer film protruding from the end of the glass plate are cut (finish cutting) to produce a sheet of laminated glass. When a hard interlayer film is used to produce a laminated glass sheet, there is a problem that edge cutting becomes difficult. As a result, there is a problem that the efficiency of laminated glass production is diminished.

[0014] An object of the present invention is to provide an interlayer film for laminated glass with which production efficiency can be increased. Furthermore, the present invention also aims to provide laminated glass prepared with the interlayer film for laminated glass.

MEANS TO SOLVE PROBLEMS

[0015] In accordance with a broad aspect of the present invention, there is provided an interlayer film for laminated glass having a one-layer structure or a two or more layer structure, including a first layer containing a thermoplastic resin, the softening point of the first layer being 60°C or more, the interlayer film having an MD direction and a TD direction, and with respect to the thermal shrinkage ratios obtained when the following first inner portion, the following second inner portion, and the following central portion are respectively heated for 20 minutes at 140°C, the entire following MD1MAX thermal shrink ratio, the following MD2MAX thermal shrink ratio and the following MD3MAX thermal shrink ratio being 45% or less.

[0016] A first inner portion: the first inner portion is represented as a 5 cm square section which is a portion at a distance of 0.05X from one end in the TD direction to the interior of the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X.

[0017] A second inner portion: the second inner portion is represented as a 5 cm square section which is a portion at a distance of 0.05X from the other end in the TD direction into the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X.

[0018] A central portion: the central portion is represented as a 5 cm square section which is a portion at a distance of 0.5X from each of one end and the other end in the TD direction into the interior of the film. interlayer when a distance between one end and the other end in the TD direction of the interlayer film is set to X.

[0019] An MD1MAX thermal shrink ratio and an MD1MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD1MAX and MD1MIN, respectively, in the case where two sides parallel to the MD direction of the first inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD1MAX and MD1MIN, respectively, in the case where two sides parallel to the MD direction of the first inner portion are the same in thermal shrinkage relationship.

[0020] An MD2MAX thermal shrink ratio and an MD2MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD2MAX and MD2MIN, respectively, in the case where two sides parallel to the MD direction of the second inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD2MAX and MD2MIN, respectively, in the case where two sides parallel to the MD direction of the second inner portion are the same in thermal shrinkage relationship.

[0021] An MD3MAX Thermal Shrink Ratio and an MD3MIN Thermal Shrink Ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD3MAX and MD3MIN, respectively, in the case where two sides parallel to the MD direction of the central portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD3MAX and MD3MIN, respectively, in the case where two sides parallel to the MD direction of the central portion are the same in thermal shrinkage relationship.

[0022] In a specific aspect of the interlayer film for laminated glass according to the present invention, the softening point of the first layer is 61.5°C or more.

[0023] In a specific aspect of the interlayer film for laminated glass according to the present invention, the glass transition temperature of the first layer is 35°C or more.

[0024] In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film also includes a second layer containing a thermoplastic resin, and the first layer is disposed on a first side of the surface of the glass. second layer.

[0025] In a specific aspect of the interlayer film for laminated glass according to the present invention, the thermoplastic resin in the first layer is a polyvinyl acetal resin and the thermoplastic resin in the second layer is a polyvinyl acetal resin.

[0026] In a specific aspect of the interlayer film for laminated glass according to the present invention, the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is greater by 9.5 mol% or more than the content of the hydroxyl group of the polyvinyl acetal resin in the second layer.

[0027] In a specific aspect of the interlayer film for laminated glass according to the present invention, the second layer contains filler.

[0028] In a specific aspect of the interlayer film for laminated glass according to the present invention, the interlayer film also includes a third layer containing a thermoplastic resin, and the third layer is disposed on a second side of the surface in the opposite side of the first surface of the second layer.

[0029] In a specific aspect of the interlayer film for laminated glass according to the present invention, the thermoplastic resin in the first layer is a polyvinyl acetal resin and the hydroxyl group content of the polyvinyl acetal resin in the first layer is 33% in mole or more.

[0030] In a specific aspect of the interlayer film for laminated glass according to the present invention, the first layer contains a plasticizer and the plasticizer content in the first layer is 25 parts by weight or more, and 35 parts by weight or less. with respect to 100 parts by weight of the thermoplastic resin in the first layer.

[0031] In a specific aspect of the interlayer film for laminated glass according to the present invention, the entire MD1MAX thermal shrinkage ratio, MD2MAX thermal shrinkage ratio and MD3MAX thermal shrinkage ratio is 40% or less.

[0032] In a specific aspect of the interlayer film for laminated glass according to the present invention, the entire MD1MIN thermal shrink ratio, MD2MIN thermal shrink ratio and MD3MIN thermal shrink ratio 20% or more.

[0033] In accordance with a broad aspect of the present invention, laminated glass is provided including a first laminated glass member, a second laminated glass member, and the interlayer film for laminated glass described above, the interlayer film. layer for laminated glass being arranged between the first laminated glass member and the second laminated glass member.

EFFECT OF THE INVENTION

[0034] Whereas the interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer structure or a structure of two or more layers and includes a first layer containing a resin thermoplastic, the softening point of the first layer is 60°C or more, the interlayer film has an MD direction and a TD direction, and with respect to the thermal shrinkage ratios obtained when the above-described first inner portion, the second portion above-described inner portion and the above-described central portion are respectively heated for 20 minutes at 140°C, the entire antecedent thermal shrinkage ratio MD1MAX, the antecedent thermal shrinkage ratio MD2MAX and the antecedent thermal contraction ratio MD3MAX is 45% or less, laminated glass production efficiency can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Fig. 1 is a partial view schematically showing an interlayer film for laminated glass in accordance with a first embodiment of the present invention.

[0036] Fig. 2 is a partial view schematically showing an interlayer film for laminated glass in accordance with a second embodiment of the present invention.

[0037] Fig. 3 is a partial view schematically showing an example of laminated glass prepared with the laminated glass interlayer film shown in Fig. 1.

[0038] Fig. 4 is a partial view schematically showing an example of laminated glass prepared with the laminated glass interlayer film shown in Fig. two.

[0039] Fig. 5 is a figure for illustrating an object to be measured (an interlayer film) for measuring the thermal shrinkage ratio.

METHOD(S) FOR CARRYING OUT THE INVENTION

[0040] Next, the present invention will be described in detail.

[0041] The present inventors have encountered a problem that when a laminated glass interlayer film is exposed to a high temperature environment at the time of producing a laminated glass sheet, a hard laminated glass interlayer film is more susceptible to shrinkage. in the MD direction of the interlayer film for laminated glass than a relatively soft interlayer film for laminated glass. Therefore, the present inventors have encountered a problem that an interlayer film for laminated glass that makes the portions to be ground thick due to shrinkage thereof as well as being a hard interlayer film for laminated glass, makes edge cutting difficult. . Furthermore, the present inventors have encountered a problem that a laminated glass interlayer film supplied as a thermoplastic resin layer having a softening point of 60°C or more is susceptible to shrinkage in the MD direction of the glass interlayer film. laminated under a high temperature environment (eg autoclave (140 °C, 20 minutes)).

[0042] In order to solve the aforementioned problems, the present invention is provided with the following configuration.

[0043] The interlayer film for laminated glass (in the present specification, sometimes abbreviated as "the interlayer film") according to the present invention has a one-layer structure or a two or more layer structure. The interlayer film according to the present invention is provided with a first layer containing a thermoplastic resin.

[0044] In the interlayer film according to the present invention, the softening point of the first layer is 60°C or more. The first layer is relatively hard. The interlayer film provided with such a first layer becomes relatively hard.

[0045] The interlayer film according to the present invention has an MD direction and a TD direction. For example, the interlayer film is obtained by melt extrusion molding. The MD direction is a flow direction of an interlayer film at the time of production of the interlayer film. The TD direction is a direction orthogonal to the flow direction of an interlayer film at the time of production of the interlayer film and a direction orthogonal to the direction of the interlayer film thickness.

[0046] In the interlayer film according to the present invention, with respect to the thermal shrinkage ratios obtained when the following first inner portion, the following second inner portion and the following central portion are respectively heated for 20 minutes at 140°C, all of the following MD1MAX thermal shrinkage ratio, the following MD2MAX thermal shrinkage ratio, and the following MD3MAX thermal shrinkage ratio is 45% or less.

[0047] A first inner portion: the first inner portion is represented as a 5 cm square section which is a portion at a distance of 0.05X (a portion separated by 0.05X) from one end in the TD direction to the interior of the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X.

[0048] A second inner portion: the second inner portion is represented as a 5 cm square section which is a portion at a distance of 0.05X (a portion separated by 0.05X) from the other end in the TD direction to the inside of the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X.

[0049] A central portion: the central portion is represented as a 5 cm square section which is a portion at a distance of 0.5X (a portion separated by 0.5X) from each of one end and the other end. in the TD direction into the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is set to X.

[0050] An MD1MAX thermal shrink ratio and an MD1MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD1MAX and MD1MIN, respectively, in the case where two sides parallel to the MD direction of the first inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD1MAX and MD1MIN, respectively, in the case where two sides parallel to the MD direction of the first inner portion are the same in thermal shrinkage relationship.

[0051] An MD2MAX thermal shrink ratio and an MD2MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD2MAX and MD2MIN, respectively, in the case where two sides parallel to the MD direction of the second inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD2MAX and MD2MIN, respectively, in the case where two sides parallel to the MD direction of the second inner portion are the same in thermal shrinkage relationship.

[0052] An MD3MAX Thermal Shrink Ratio and an MD3MIN Thermal Shrink Ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio are defined as MD3MAX and MD3MIN, respectively, in the case where two sides parallel to the MD direction of the central portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side are defined as MD3MAX and MD3MIN, respectively, in the case where two sides parallel to the MD direction of the central portion are the same in thermal shrinkage relationship.

[0053] By adopting the above-described configuration in the interlayer film according to the present invention, the efficiency of laminated glass production can be increased.

[0054] In the interlayer film according to the present invention, despite the existence of the first layer having a softening point of 60°C or more, the interlayer film for laminated glass is less susceptible to shrinking in the MD direction under a high temperature environment (eg autoclave (140 °C, 20 minutes)). As such, the finishing cut at the time of producing a laminated glass sheet can be carried out easily. As such, the efficiency of laminated glass production can be increased.

[0055] From the point of view of also increasing the efficiency of laminated glass production, each of the MD1MIN thermal shrinkage ratio, MD2MIN thermal shrinkage ratio and MD3MIN thermal shrinkage ratio is preferably 15% or more, more preferably 20% or more, also preferably more than 20% and especially preferably 25% or more. From the point of view of effectively increasing the efficiency of laminated glass production, each of the MD1MAX thermal shrinkage ratio, MD2MAX thermal shrinkage ratio and MD3MAX thermal shrinkage ratio is preferably 45% or less, more preferably 40% or less and also preferably 35% or less. It is preferred that between the MD1MAX thermal shrink ratio, MD2MAX thermal shrink ratio and MD3MAX thermal shrink ratio, at least one thermal shrink ratio is more than 20%.

[0056] Examples of a method of achieving the aforementioned thermal shrinkage ratio include a method of relaxing the tension of an interlayer film, and the like. Specifically, examples thereof include a method of subjecting an interlayer film to an annealing treatment, a force weakening method for pulling an interlayer film in the extrusion process, and the like. Furthermore, by adjusting the aging temperature at the time of synthesizing a polyvinyl acetal resin, the heat shrinkage of the resulting interlayer film can be controlled. In the extrusion process, when a case 1 where an interlayer film in a state of having a high temperature (e.g. a case of more than 90°C) is pulled out and a case 2 where an interlayer film in a state of having a low temperature (e.g. a case of 90 °C or less) is taken off are compared, there is a tendency that the thermal shrinkage ratio of the interlayer film in case 2 becomes higher than the ratio shrinkage of the interlayer film in case 1. Also, in the extrusion process, even if two interlayer films are in a state of having the same temperature, when a case 3 where one interlayer film is peeled off by strong force (e.g. a case of relatively fast linear speed) and a case 4 where an interlayer film is peeled off by weak force (e.g. a case of relatively slow linear speed) are compared, there is a tendency that the thermal contraction ratio that of the interlayer film in case 3 becomes higher than the thermal shrinkage ratio of the interlayer film in case 4.

[0057] The objects to be measured (an interlayer film A1, an interlayer film A2 and an interlayer film A3) to measure the thermal shrinkage ratio in the MD direction of the first inner portion, the thermal shrinkage ratio in the MD direction of the second inner portion and the thermal contraction relationship in the MD direction of the central portion can be obtained as follows.

[0058] As shown in Fig. 5, an interlayer film is cut from one end to the other end in the TD direction so that the dimension in the MD direction of the interlayer film becomes 10 cm to obtain an interlayer film A. By a method in which the change dimension of the interlayer film A is not suppressed (the interlayer film A is allowed to rest on a mesh shelf and remain in place, or similar), its humidity control is carried out for 2 days at 23 °C and 30% of HR. Subsequently, as shown in Fig. 5, from moisture-controlled interlayer film A, an interlayer film A1 (a test specimen) as a 5 cm square section which is a portion at a distance of 0.05X from one end on the TD inward direction, an A2 interlayer film (one test specimen) as a 5 cm square section which is a portion at a distance of 0.05X from the other end in the TD direction inward, and a of A3 interlayer (a test specimen) as a 5 cm square section which is a portion at a distance of 0.5X from each of one end and the other end in the TD direction of the interlayer film inward are obtained . The interlayer film A1 is positioned so that a line segment at a distance of 0.05X from one end in the TD direction inward is superimposed with the centerline of the interlayer film A1 to obtain the interlayer film A1. layer A1 with a square shape of 5 cm square. The interlayer film A2 is positioned so that a line segment at a distance of 0.05X from the other end in the TD direction inward is superimposed with the centerline of the interlayer film A2 to obtain the interlayer film A2. interlayer A2 with a square shape of 5 cm square. The A3 interlayer film is positioned so that a line segment at a distance of 0.5X from each end and the other end in the TD direction inward is superimposed with the centerline of the A3 interlayer film to obtain the A3 interlayer film with a square shape of 5 cm square.

[0059] The interlayer film A1, the interlayer film A2 and the interlayer film A3 are respectively heated for 20 minutes at 140°C. At the time of heating, the interlayer film A1, the interlayer film A2 and the interlayer film A3 are not fixed and are laid horizontally on a fluororesin sheet ("Article number 7-363" available from AS ONE Corporation, 5 mm thick) placed inside a hot air dryer (a programmed constant temperature drying oven "Model type DO-600FPA" available from AS ONE Corporation). In this context, the fluororesin sheet is placed inside a hot air dryer at 140 °C to be preheated for 20 minutes, after which the interlayer film A1, the interlayer film A2 and the interlayer film A3 are placed horizontally on the preheated fluororesin sheet.

[0060] Before and after heat treatment, the interlayer film is measured for length in the MD direction with an accuracy of 0.1 cm unit. Between two sides parallel to the MD direction of the A1 interlayer film, the length of a side on one end side in the TD direction is measured to calculate a thermal shrinkage ratio. The thermal shrinkage ratio measurement is performed three times in the same way, and an average value thereof is defined as the thermal shrinkage ratio from one side to one edge side in the TD direction between the two sides parallel to the MD direction of the film. of interlayer A1. Then, between the two sides parallel to the MD direction of the interlayer film A1, the length across the edge in the TD direction is measured to calculate a thermal shrinkage ratio. The thermal shrinkage ratio measurement is performed three times in the same way, and an average value of the same is defined as the thermal shrinkage ratio from one side to the other side of the edge in the TD direction between the two sides parallel to the MD direction of the film. of interlayer A1. Furthermore, the thermal shrinkage ratio from one side of the edge in the TD direction of the interlayer film A1 and the thermal shrinkage ratio from one side to the other side of the edge in the TD direction of the same are compared, and the ratio of thermal shrinkage of a higher side to thermal shrinkage ratio is defined as MD1MAX and the thermal contraction ratio of a lower side to thermal shrinkage ratio is defined as MD1MIN. In this context, when the side to side thermal shrinkage ratio of the edge in the TD direction of the interlayer film A1 and the side to side thermal shrinkage ratio of the edge in the TD direction of the same are equal to each other, two numeric values of MD1MAX and MD1MIN match each other. Similarly, MD2MAX and MD2MIN of the A2 interlayer film and MD3MAX and MD3MIN of the A3 interlayer film are respectively determined.

[0061] The thermal shrinkage ratio is determined by the following Equation (X).

[0062] Thermal shrinkage ratio % = (dimension in MD direction before heat treatment - dimension in MD direction after heat treatment)/dimension in MD direction before heat treatment x 100... Equation (X)

[0063] Furthermore, when the dimension in the TD direction of the interlayer film is 15 cm or more, and less than 50 cm, with respect to the interlayer film A1 and the interlayer film A2, the square-shaped interlayer films with a 5 cm side in the TD direction and a 5 cm side in the MD direction are cut from the portions at one end and the other end of the interlayer film, respectively. Furthermore, when the dimension in the TD direction of the interlayer film is less than 15 cm, with respect to the interlayer film A1, the interlayer film A2 and the interlayer film A3, based on a dimension in the TD direction obtained when the distance in the TD direction is divided into three equal lengths, the square-shaped interlayer films are cut from this. In this context, the preferred lower limit of the dimension in the TD direction of the interlayer film is 50 cm, the most preferred lower limit of the same is 70 cm, the additional preferred lower limit of the same is 80 cm, the preferred upper limit of the same is 500 cm, the most preferred upper limit thereof is 400 cm and the additional preferred upper limit thereof is 300 cm.

[0064] The interlayer film can have a one-layer structure, it can have a two-layer structure, it can have a two or more layer structure, it can have a three layer structure and it can have a three or more layer structure . When the interlayer film is an interlayer film having a one-layer structure, the first layer corresponds to the interlayer film. When the interlayer film is an interlayer film having a structure of two or more layers, the interlayer film is provided with the first layer and an additional layer (a second layer, a third layer and the like).

[0065] From the point of view of also increasing the efficiency of laminated glass production, it is preferred that the interlayer film be provided with the first layer as a surface layer. It is preferred that the interlayer film be provided with a third layer described below as a surface layer.

[0066] Next, specific embodiments of the present invention will be described with reference to the drawings.

[0067] Fig. 1 shows an interlayer film for laminated glass according to a first embodiment of the present invention schematically represented as a partial view.

[0068] An interlayer film 11 shown in Fig. 1 is a multilayer interlayer film having a two or more layer structure. Interlayer film 11 is used to obtain laminated glass. Interlayer film 11 is an interlayer film for laminated glass. The interlayer film 11 is provided with a first layer 1, a second layer 2 and a third layer 3. The first layer 1 is arranged on a first surface 2a of the second layer 2 to be layered thereon. The third layer 3 is arranged on a second surface 2b opposite the first surface 2a of the second layer 2 to be layered thereon. The second layer 2 is an intermediate layer. Each of the first layer 1 and the third layer 3 is a protective layer and is a surface layer in the present embodiment. The second layer 2 is arranged between the first layer 1 and the third layer 3 to be interleaved therebetween. Suitably, the interlayer film 11 has a multilayer structure (a first layer 1/a second layer 2/a third layer 3) wherein the first layer 1, the second layer 2 and the third layer 3 are layered on this layer. order.

[0069] In this context, other layers can be arranged between the first layer 1 and the second layer 2 and between the second layer 2 and the third layer 3, respectively. It is preferred that each of the first layer 1 and the third layer 3 be layered directly onto the second layer 2. Examples of another layer include a layer containing polyethylene terephthalate and the like.

[0070] Fig. 2 shows an interlayer film for laminated glass according to a second embodiment of the present invention schematically represented as a partial view.

[0071] The interlayer film 11A shown in Fig. 2 is a single-layer interlayer film having a one-layer structure. The interlayer film 11A is made up of a first layer alone. 11A interlayer film is used to obtain laminated glass. Interlayer film 11A is an interlayer film for laminated glass.

[0072] The interlayer film may be provided with a second layer as an intermediate layer of the interlayer film or a layer which is not a surface layer of the interlayer film. It is preferred that the interlayer film is provided with a first layer as a surface layer of the interlayer film. It is preferred that the interlayer film is provided with a third layer as a surface layer of the interlayer film.

[0073] Next, the details of the first layer, the second layer and the third layer that constitute the interlayer film according to the present invention, and the details of each ingredient contained in the first layer, the second layer and the third layer will be described. (Polyvinyl acetal resin or thermoplastic resin)

[0074] The first layer contains a thermoplastic resin (then sometimes described as a thermoplastic resin(1)), and it is preferred that the first layer contains a polyvinyl acetal resin (then sometimes described as a resin of polyvinyl acetal (1)) as the thermoplastic resin (1). The second layer contains a thermoplastic resin (hereinafter sometimes described as a thermoplastic resin (2)), and it is preferred that the second layer contains a polyvinyl acetal resin (hereinafter sometimes described as a polyvinyl acetal resin (2)) as the thermoplastic resin (2). The third layer contains a thermoplastic resin (hereafter sometimes described as a thermoplastic resin (3)), and it is preferred that the third layer contains a polyvinyl acetal resin (hereafter sometimes described as a polyvinyl acetal resin 3) as thermoplastic resin 3. Although polyvinyl acetal resin 1, polyvinyl acetal resin 2 and polyvinyl acetal resin 3 may be the same or different from each other, it is preferred that polyvinyl acetal resin 2 is different of polyvinyl acetal resin 1 and polyvinyl acetal resin 3 because the sound insulating properties are also increased. The thermoplastic resin 1 and the thermoplastic resin 3 can be the same as or different from each other. One type of each of polyvinyl acetal resin 1, polyvinyl acetal resin 2 and polyvinyl acetal resin 3 can be used alone, and two or more types thereof can be used in combination. One type each of thermoplastic resin 1, thermoplastic resin 2 and thermoplastic resin 3 can be used alone, and two or more types thereof can be used in combination.

[0075] Examples of the thermoplastic resin include a polyvinyl acetal resin, an ethylene-vinyl acetate copolymer resin, an ethylene-acrylic acid copolymer resin, a polyurethane resin, a polyvinyl alcohol resin, and the like. Thermoplastic resins other than these can be used.

[0076] For example, polyvinyl acetal resin can be produced by acetalizing polyvinyl alcohol with an aldehyde. For example, polyvinyl alcohol can be obtained by saponifying polyvinyl acetate. The degree of saponification of polyvinyl alcohol generally ranges from 70 to 99.9% by mol.

[0077] The average degree of polymerization of polyvinyl alcohol (PVA) is preferably 200 or more, more preferably 500 or more, even more preferably 1500 or more, also preferably 1600 or more, especially preferably 2600 or more, preferably 2700 or more, preferably 5000 or less, more preferably 4000 or less and also preferably 3500 or less. When the average degree of polymerization is the lower limit above or more, the penetration resistance of laminated glass is also enhanced. When the average degree of polymerization is the upper limit above or below, the formation of an interlayer film is facilitated.

[0078] The average degree of polymerization of polyvinyl alcohol is determined by a method according to JIS K6726 "Testing methods for polyvinyl alcohol".

[0079] It is preferred that the number of carbon atoms of the acetal group in the polyvinyl acetal resin is within the range of 3 to 5, and it is preferred that the number of carbon atoms of the acetal group is 4 or 5.

[0080] In general, like the aldehyde, an aldehyde with 1 to 10 carbon atoms is appropriately used. Examples of the aldehyde having 1 to 10 carbon atoms include formaldehyde, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-valeraldehyde, 2-ethylbutyraldehyde, n-hexylaldehyde, n-octylaldehyde, n-nonylaldehyde, n-decylaldehyde, benzaldehyde - do, and the like. Of these, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexylaldehyde or n-valeraldehyde is preferred, acetaldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde or n-valeraldehyde is more preferred, and n-butyraldehyde or n-valeraldehyde is also preferred. One type of the aldehyde may be used alone, and two or more types of the same may be used in combination.

[0081] The hydroxyl group content ratio (the amount of hydroxyl groups) of the polyvinyl acetal resin (2) is preferably 17 mol % or more, more preferably 20 mol % or more, also preferably 22 mol % or more, preferably 30 mol% or less, more preferably less than 27 mol %, also preferably 25 mol % or less and especially preferably less than 25 mol %. When the hydroxyl group content is the lower limit above or more, the adhesive strength of the interlayer film is also increased. In particular, when the hydroxyl group content of the polyvinyl acetal (2) resin is 20 mol% or more, the resin is high in reaction efficiency and excellent in productivity, and furthermore, when less than 27 mol% , the sound-insulating properties of laminated glass are also enhanced. Furthermore, when the hydroxyl group content is the upper limit above or below, the flexibility of the interlayer film is enhanced and handling of the interlayer film is facilitated.

[0082] The hydroxyl group content of each of the polyvinyl acetal resin (1) and the polyvinyl acetal resin (3) is preferably 25 mol % or more, more preferably 28 mol % or more, most preferably 30 mol % or more, even more preferably more than 31 mol %, also preferably 31.5 mol % or more, still also preferably 32 mol % or more, especially preferably 33 mol % or more, preferably 37 % by mol or less, more preferably 36.5% by mol or less and also preferably 36% by mol or less. When the hydroxyl group content is the lower limit above or more, the adhesive strength of the interlayer film is also increased. Furthermore, when the hydroxyl group content is the upper limit above or below, the flexibility of the interlayer film is enhanced and handling of the interlayer film is facilitated.

[0083] From the point of view of enhancing the rigidity of laminated glass and increasing the efficiency of producing laminated glass effectively, it is especially preferred that the hydroxyl group content of each of polyvinyl acetal resin 1 and polyvinyl resin acetal 3 is 33% by mol or more.

[0084] From the point of view of also increasing the sound insulating properties, it is preferred that each of the content of the hydroxyl group of the polyvinyl acetal resin 1 and the content of the hydroxyl group of the polyvinyl acetal resin 3 is greater than the content of the hydroxyl group of the polyvinyl acetal resin 2. From the point of view of also increasing the sound insulation properties, each of the absolute value of the difference between the content of the hydroxyl group of the polyvinyl acetal resin 1 and the content of the hydroxyl group of the polyvinyl acetal resin 2 and the absolute value of the difference between the content of the hydroxyl group of the polyvinyl acetal resin 3 and the content of the hydroxyl group of the polyvinyl acetal resin 2 is preferably 1 mol %. or more, more preferably 5 mol % or more, also preferably 9 mol % or more, still also preferably 9.5 mol % or more, especially preferably 10 mol % or more, and preferably 12 mol % or more . Each of the absolute value of the difference between the content of the hydroxyl group of polyvinyl acetal resin 1 and the content of the hydroxyl group of polyvinyl acetal resin 2 and the absolute value of the difference between the content of the hydroxyl group of polyvinyl acetal resin 3 and the hydroxyl group content of the polyvinyl acetal resin 2 is preferably 20 mol% or less.

[0085] From the point of view of enhancing the rigidity of laminated glass and increasing the efficiency of producing laminated glass effectively, it is especially preferred that the hydroxyl group content of polyvinyl acetal resin 1 is higher by 9.5% in mol or more than the content of the hydroxyl group of the polyvinyl acetal resin 2. From the point of view of also increasing the efficiency of laminated glass production, it is especially preferred that the content of the hydroxyl group of the polyvinyl acetal resin 3 is greater by 9.5 mol% or more than the hydroxyl group content of the polyvinyl acetal resin 2.

[0086] The content of the hydroxyl group of the polyvinyl acetal resin is a fraction in mol, represented in percentage, obtained by dividing the amount of ethylene groups to which the hydroxyl group is attached by the total amount of ethylene groups in the main chain. For example, the amount of ethylene groups to which the hydroxyl group is attached can be measured in accordance with JIS K6728 "Testing methods for polyvinyl butyral" to be determined.

[0087] The degree of acetylation (the amount of acetyl groups) of the polyvinyl acetal resin (2) is preferably 0.01% by mol or more, more preferably 0.1% by mol or more, even more preferably 7% by mol or more, also preferably 9 mol % or more, preferably 30 mol % or less, more preferably 25 mol % or less, also preferably 24 mol % or less and especially preferably 20 mol % or less. When the degree of acetylation is the lower limit above or more, the compatibility between the polyvinyl acetal resin and a plasticizer is increased. When the degree of acetylation is the upper limit above or below, with respect to the interlayer film and laminated glass, the moisture resistance of the same is enhanced. In particular, when the degree of acetylation of the polyvinyl acetal resin (2) is 0.1 mol% or more, and 25 mol% or less, the resulting laminated glass is excellent in penetration resistance.

[0088] The degree of acetylation of each of polyvinyl acetal resin 1 and polyvinyl acetal resin 3 is preferably 0.01 mol % or more, more preferably 0.5 mol % or more, preferably 10 mol % or less and more preferably 2 mol% or less. When the degree of acetylation is the lower limit above or more, the compatibility between the polyvinyl acetal resin and a plasticizer is increased. When the degree of acetylation is the upper limit above or below, with respect to the interlayer film and laminated glass, the moisture resistance of the same is enhanced.

[0089] The degree of acetylation is a fraction in mol, represented in percentage, obtained by dividing the amount of ethylene groups to which the acetyl group is attached by the total amount of ethylene groups in the main chain. For example, the amount of ethylene groups to which the acetyl group is attached can be measured according to JIS K6728 "Testing methods for polyvinyl butyral."

[0090] The degree of acetalization of the polyvinyl acetal resin (2) (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 47 mol% or more, more preferably 60 mol% or more, preferably 85% by mol or less, more preferably 80% by mol or less and also preferably 75% by mol or less. When the degree of acetalization is the lower limit above or more, the compatibility between the polyvinyl acetal resin and a plasticizer is increased. When the degree of acetalization is the upper limit above or below, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0091] The degree of acetalization of each of polyvinyl acetal resin 1 and polyvinyl acetal resin 3 (the degree of butyralization in the case of a polyvinyl butyral resin) is preferably 55 mol% or more, more preferably 60% by mol or more, preferably 75% by mol or less and more preferably 71% by mol or less. When the degree of acetalization is the lower limit above or more, the compatibility between the polyvinyl acetal resin and a plasticizer is increased. When the degree of acetalization is the upper limit above or below, the reaction time required to produce the polyvinyl acetal resin is shortened.

[0092] The degree of acetalization is a fraction in mol, represented in percentage, obtained by dividing a value obtained by subtracting the amount of ethylene groups to which the hydroxyl group is attached and the amount of ethylene groups to which the acetyl group is bonded from the total amount of ethylene groups on the main chain by the total amount of ethylene groups on the main chain.

[0093] In this context, it is preferred that the content of the hydroxyl group (the amount of hydroxyl groups), the degree of acetalization (the degree of butyralization) and the degree of acetylation are calculated from the results measured by a method according to JIS K6728 "Testing methods for polyvinyl butyral." In this context, a method according to ASTM D1396-92 can be used. When the polyvinyl acetal resin is a polyvinyl butyral resin, the hydroxyl group content (the amount of hydroxyl groups), the degree of acetalization (the degree of butyralization) and the degree of acetylation can be calculated from the results measured by a method according to JIS K6728 "Testing methods for polyvinyl butyral."

[0094] From the point of view of also improving the penetration resistance of laminated glass, it is preferred that the polyvinyl acetal resin 2 is a polyvinyl acetal resin A with an acetylation degree of less than 8% in mol and a degree of acetalization a of 65% in mol or more, or a polyvinyl acetal resin B with a degree of acetylation b of 8% in mol or more. Each of polyvinyl acetal resin 1 and polyvinyl acetal resin 3 can be polyvinyl acetal resin A and can be polyvinyl acetal resin B.

[0095] The degree of acetylation of the polyvinyl acetal resin A is less than 8% by mol, preferably 7.9% by mol or less, more preferably 7.8% by mol or less, also preferably 6.5% by mol. mol or less, especially preferably 6 mol % or less, preferably 0.1 mol % or more, more preferably 0.5 mol % or more, also preferably 5 mol % or more, and especially preferably 5.5% in mole or more. When the degree of acetylation a is 0.1 mol% or more, and less than 8 mol%, the transfer of a plasticizer can be easily controlled and the sound insulating properties of laminated glass are also enhanced.

[0096] The degree of acetalization a of polyvinyl acetal resin A is 65 mol % or more, preferably 66 mol % or more, more preferably 67 mol % or more, also preferably 67.5 mol % or more, especially preferably 75 mol % or less, preferably 85 mol % or less, more preferably 84 mol % or less, also preferably 83 mol % or less and especially preferably 82 mol % or less. When the degree of acetalization a is the lower limit above or more, the sound insulating properties of laminated glass are also increased. When the degree of acetalization a is the upper limit above or less, the reaction time required to produce polyvinyl acetal resin A can be shortened.

[0097] The a content of the hydroxyl group of the polyvinyl acetal resin A is preferably 18 mol % or more, more preferably 19 mol % or more, also preferably 20 mol % or more, especially preferably 21 mol % or more , preferably 23 mol% or more, preferably 31 mol % or less, more preferably 30 mol % or less, also preferably 29 mol % or less and especially preferably 28 mol % or less. When the α content of the hydroxyl group is the lower limit above or more, the adhesive strength of the second layer is also increased. When the α content of the hydroxyl group is the upper limit above or below, the sound insulating properties of laminated glass are also increased.

[0098] The degree of acetylation b of polyvinyl acetal resin B is 8 mol % or more, preferably 9 mol % or more, more preferably 9.5 mol % or more, also preferably 10 mol % or more, especially preferably 10.5 mol % or more, preferably 30 mol % or less, more preferably 28 mol % or less, also preferably 26 mol % or less and especially preferably 24 mol % or less. When the degree of acetylation b is the lower limit above or more, the sound insulating properties of laminated glass are also increased. When the degree of acetylation b is the upper limit above or less, the reaction time required to produce polyvinyl acetal resin B can be shortened.

[0099] The degree of acetalization b of the polyvinyl acetal resin B is preferably 50 mol % or more, more preferably 53 mol % or more, also preferably 55 mol % or more, especially preferably 60 mol % or more, preferably 78 mol % or less, more preferably 75 mol % or less, also preferably 72 mol % or less and especially preferably 70 mol % or less. When the degree of acetalization b is the lower limit above or more, the sound insulating properties of laminated glass are also increased. When the degree of acetalization b is the upper limit above or less, the reaction time required to produce polyvinyl acetal resin B can be shortened.

[00100] The content b of the hydroxyl group of the polyvinyl acetal resin B is preferably 18 mol % or more, more preferably 19 mol % or more, also preferably 20 mol % or more, especially preferably 21 mol % or more , preferably 23 mol% or more, preferably 31 mol % or less, more preferably 30 mol % or less, also preferably 29 mol % or less and especially preferably 28 mol % or less. When the content b of the hydroxyl group is the lower limit above or more, the adhesive strength of the second layer is also increased. When the content b of the hydroxyl group is the upper limit above or below, the sound insulating properties of laminated glass are also increased.

[00101] It is preferred that each of the polyvinyl acetal resin A and the polyvinyl acetal resin B is a polyvinyl butyral resin. (Plasticizer)

[00102] It is preferred that the first layer (including a single layer interlayer film) contain a plasticizer (hereinafter sometimes described as a plasticizer 1). It is preferred that the second layer contain a plasticizer (hereinafter sometimes described as a plasticizer 2). It is preferred that the third layer contain a plasticizer (hereinafter sometimes described as a plasticizer 3). By using the plasticizer or using a polyvinyl acetal resin and a plasticizer together, the adhesive strength of a layer containing the polyvinyl acetal resin and the plasticizer to a lamination glass member or other layer is moderately increased. The plasticizer is not particularly limited. Plasticizer 1, plasticizer 2 and plasticizer 3 can be the same or different from each other. One type each of plasticizer 1, plasticizer 2 and plasticizer 3 can be used alone, and two or more types thereof can be used in combination.

[00103] Examples of the plasticizer include organic ester plasticizers such as a monobasic organic acid ester and a polybasic organic acid ester, organic phosphate plasticizers such as an organic phosphate plasticizer and an organic phosphite plasticizer, and the like. Of these, organic ester plasticizers are preferred. It is preferred that the plasticizer is a liquid plasticizer.

[00104] Examples of the monobasic organic acid ester include a glycol ester obtained by reacting a glycol with a monobasic organic acid, and the like. Examples of the glycol include triethylene glycol, tetraethylene glycol, tripropylene glycol, and the like. Examples of the monobasic organic acid include butyric acid, isobutyric acid, caproic acid, 2-ethylbutyric acid, heptanoic acid, n-octylic acid, 2-ethylhexanoic acid, n-nonylic acid, decanoic acid, and the like.

[00105] Examples of the polybasic organic acid ester include an ester compound of a polybasic organic acid and an alcohol having a linear or branched structure of 4 to 8 carbon atoms. Examples of the polybasic organic acid include adipic acid, sebacic acid, azelaic acid, and the like.

[00106] Examples of the organic ester plasticizer include triethylene glycol di-2-ethylpropanoate, triethylene glycol di-2-ethylbutyrate, triethylene glycol di-2-ethyl hexanoate, triethylene glycol dicaprylate, triethylene glycol di-n-octanoate triethylene glycol, triethylene glycol di-n-heptanoate, tetraethylene glycol di-n-heptanoate, dibutyl sebacate, dioctyl azelate, dibutyl carbitol adipate, ethylene glycol di-2-ethylbutyrate, 1,3-di-2-ethylbutyrate propylene glycol, 1,4-butylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, diethylene glycol di-2-ethylhexanoate, dipropylene glycol di-2-ethylbutyrate, di-2-ethylpentanoate of triethylene glycol, tetraethylene glycol di-2-ethylbutyrate, diethylene glycol dicaprylate, dihexyl adipate, dioctyl adipate, hexyl cyclohexyl adipate, a mixture of heptyl adipate and nonyl adipate, diisononyl adipate, di- isodecyl adipate, heptyl nonyl adipate, dibutyl sebacate, oil modified sebacic alkyds, a mixture of a phosphoric acid ester and an adipic acid ester, and the like. Organic ester plasticizers other than these may be used. Other adipic acid esters other than the adipic acid esters described above may be used.

[00107] Examples of the organic phosphate plasticizer include Tributoxyethyl Phosphate, Isodecyl Phenyl Phosphate, Triisopropyl Phosphate, and the like.

[00108] It is preferred that the plasticizer is a diester plasticizer represented by the following formula (1). chemical formula 1

[00109] In the foregoing formula (1), R1 and R2 each represent an organic group with 2 to 10 carbon atoms, R3 represents an ethylene group, an isopropylene group or an n-propylene group, and p represents an integer of 3 to 10. It is preferred that R1 and R2 in the foregoing formula (1) are each an organic group having 5 to 10 carbon atoms, and it is more preferred that R1 and R2 are each an organic group having 6 to 10 carbon atoms. carbon.

[00110] It is preferred that the plasticizer includes triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2-ethylbutyrate (3GH) or triethylene glycol di-2-ethylpropanoate, it is more preferred that the plasticizer includes triethylene glycol di-2-ethylhexanoate or triethylene glycol di-2-ethylbutyrate, and it is also preferred that the plasticizer includes triethylene glycol di-2-ethylhexanoate.

[00111] Each of the content of plasticizer 1 (hereinafter sometimes described as content 1) relative to 100 parts by weight of thermoplastic resin 1 (100 parts by weight of a polyvinyl acetal resin 1 when thermoplastic resin 1 is polyvinyl acetal resin 1) and the content of plasticizer 3 (hereinafter sometimes described as content 3) relative to 100 parts by weight of thermoplastic resin 3 (100 parts by weight of a polyvinyl acetal resin 3 when thermoplastic resin 3 is polyvinyl acetal resin 3) is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, also preferably 20 parts by weight or more, still also preferably 25 parts by weight or more, especially preferably 30 parts by weight or more, preferably 40 parts by weight or less, more preferably 39 parts by weight or less, also preferably 35 parts by weight or less, still also preferably 32 parts by weight or less, and especially pre preferably 30 parts by weight or less. When the content 1 and the content 3 are the lower limit above or higher, the flexibility of the interlayer film is enhanced and handling of the interlayer film is facilitated. When the grade 1 and grade 3 are the upper limit above or below, the penetration resistance of laminated glass is also enhanced.

[00112] From the point of view of enhancing the rigidity of laminated glass and increasing the efficiency of producing laminated glass effectively, it is preferred that the content 1 is 25 parts by weight or more, and 35 parts by weight or less. From the point of view of effectively increasing the efficiency of laminated glass production, it is preferred that the content 3 is 25 parts by weight or more, and 35 parts by weight or less.

[00113] The content of plasticizer 2 (hereinafter sometimes described as content 2) relative to 100 parts by weight of thermoplastic resin 2 (100 parts by weight of a polyvinyl acetal resin 2 when thermoplastic resin 2 is the polyvinyl acetal resin 2) is preferably 50 parts by weight or more, more preferably 55 parts by weight or more, also preferably 60 parts by weight or more, preferably 100 parts by weight or less, more preferably 90 parts by weight or less, also preferably 85 parts by weight or less and especially preferably 80 parts by weight or less. When the content (2) is the lower limit above or higher, the flexibility of the interlayer film is enhanced and handling of the interlayer film is facilitated. When the 2 content is the upper limit above or below, the penetration resistance of laminated glass is also enhanced.

[00114] In order to increase the sound insulation properties of laminated glass, it is preferred that the content 2 is greater than the content (1) and it is preferred that the content 2 is greater than the content 3.

[00115] From the point of view of also increasing the sound insulation properties of laminated glass, each of the absolute value of the difference between the content 1 and the content 2 and the absolute value of the difference between the content 3 and the content 2 is preferably 10 parts by weight or more, more preferably 15 parts by weight or more, also preferably 20 parts by weight or more, and especially preferably more than 25 parts by weight. Each of the absolute value of the difference between content 1 and content 2 and the absolute value of the difference between content 3 and content 2 is preferably 80 parts by weight or less, more preferably 75 parts by weight or less, and also preferably 70 parts by weight or less.

(Charge)

[00116] It is preferred that the second layer contains a type of filler. The first layer can contain a type of payload. The third layer can contain a type of filler.

[00117] Examples of the filler include calcium carbonate particles, silica particles, and the like. It is preferred that the filler is comprised of calcium carbonate particles or silica particles, and it is more preferred that the filler is comprised of silica particles. By using the filler, the sound-insulating properties and flexural rigidity are enhanced, and in addition, the adhesive strength between the respective layers is also increased. One load type can be used alone, and two or more load types can be used in combination.

[00118] The specific surface area by the BET method of the silica particle is preferably 50 m 2 /g or more, more preferably 100 m 2 /g or more, also preferably 200 m 2 /g or more, especially preferably 250 m 2 /g or more, preferably 300 m2/g or more, and preferably 500 m2/g or less. Specific surface area can be measured by a gas absorption method using a fine pore/specific surface area distribution measurement mechanism. Examples of the measurement engine include "ASAP 2420" available from SHIMADZU CORPORATION, and the like.

[00119] In the second layer, with respect to 100 parts by weight of thermoplastic resin 2, the filler content is preferably 2 parts by weight or more, more preferably 5 parts by weight or more, also preferably 10 parts by weight or more, preferably 65 parts by weight or less, more preferably 60 parts by weight or less, also preferably 50 parts by weight or less and especially preferably 30 parts by weight or less. When the filler content is the lower limit above or more, and the upper limit above or below, the adhesive strength between the respective layers is also increased and the flexural rigidity is also enhanced. When the filler content is the upper limit above or below, the sound insulating properties are also increased. (Thermal shielding compound)

[00120] It is preferred that the interlayer film includes a heat shielding compound. It is preferred that the first layer contains a heat shielding compound. It is preferred that the second layer contains a heat shielding compound. It is preferred that the third layer contains a heat shielding compound. One type of heat shielding compound can be used alone, and two or more types of the same can be used in combination. Ingredient X:

[00121] It is preferred that the interlayer film includes at least one type of Ingredient X among a phthalocyanine compound, a naphthalocyanine compound and an anthracyanine compound. It is preferred that the first layer contains Ingredient X. It is preferred that the second layer contains Ingredient X. It is preferred that the third layer contains Ingredient X. Ingredient X is a heat shielding compound. One type of Ingredient X can be used alone, and two or more types of Ingredient X can be used in combination.

[00122] Ingredient X is not particularly limited. As Ingredient X, conventionally known phthalocyanine compound, naphthalocyanine compound and anthracyanine compound can be used.

[00123] With respect to interlayer film and laminated glass, from the point of view of also enhancing the thermal shielding properties thereof, it is preferred that Ingredient X is at least one type selected from the group consisting of phthalocyanine, a phthalocyanine derivative, naphthalocyanine and a naphthalocyanine derivative, and it is more preferred that Ingredient X is at least one type between phthalocyanine and a phthalocyanine derivative.

[00124] From the viewpoints of effectively enhancing the thermal shielding properties and keeping the visible light transmittance at a higher level over a longer period of time, it is preferred that Ingredient X contains vanadium atoms or copper. It is preferred that Ingredient X contains vanadium atoms and it is preferred that Ingredient X contains copper atoms. It is more preferred that Ingredient X is at least one type between phthalocyanine containing vanadium atoms or copper atoms and a phthalocyanine derivative containing vanadium atoms or copper atoms. With respect to the interlayer film and laminated glass, from the point of view of also enhancing the thermal shielding properties thereof, it is preferred that Ingredient X has a structural unit in which an oxygen atom is bonded to an atom of vanadium.

[00125] In 100% by weight of a layer containing Ingredient X (a first layer, a second layer or a third layer), the content of Ingredient X is preferably 0.001% by weight or more, more preferably 0.005% by weight or more, even more preferably 0.01% by weight or more, especially preferably 0.02% by weight or more, preferably 0.2% by weight or less, more preferably 0.1% by weight or less, even more preferably 0 .05% by weight or less and especially preferably 0.04% by weight or less. When the content of Ingredient X is the lower limit above or more and the upper limit above or below, the heat shielding properties are sufficiently enhanced and the visible light transmittance is sufficiently increased. For example, you can make visible light transmittance 70% or more. Thermal shielding particles:

[00126] It is preferred that the interlayer film includes heat shielding particles. It is preferred that the first layer contain the heat shield particles. It is preferred that the second layer contains the heat shield particles. It is preferred that the third layer contain the heat shield particles. The heat shield particle is a heat shield compound. By using heat shielding particles, infrared rays (heat rays) can be effectively cut. One type of heat shielding particles can be used alone, and two or more types of the same can be used in combination.

[00127] From the point of view of also enhancing the heat shielding properties of laminated glass, it is more preferred that the heat shielding particles are metal oxide particles. It is preferred that the heat shield particle is a particle (a metal oxide particle) formed from an oxide of a metal.

[00128] The amount of energy of an infrared ray with a wavelength of 780 nm or longer, which is longer than that of visible light, is small compared to an ultraviolet ray. However, the thermal action of infrared rays is great, and when infrared rays are absorbed into a substance, heat is released from the substance. As such, infrared rays are often called heat rays. By using heat shielding particles, infrared rays (heat rays) can be effectively cut. In this context, heat shielding particle means a particle capable of absorbing infrared rays.

[00129] Specific examples of heat shield particles include metal oxide particles such as aluminum-doped tin oxide particles, indium-doped tin oxide particles, antimony-doped tin oxide particles (ATO particles), gallium-doped zinc oxide particles (GZO particles), indium-doped zinc oxide particles (IZO particles), aluminum-doped zinc oxide particles (AZO particles), niobium-doped titanium oxide particles , sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles, tin-doped indium oxide particles ( ITO), tin-doped zinc oxide particles and silicon-doped zinc oxide particles, lanthanum hexaboride (LaB6) particles, and the like. Thermal shielding particles other than these can be used. Of these, since the heat ray shielding function is high, metal oxide particles are preferred, ATO particles, GZO particles, IZO particles, ITO particles or tungsten oxide particles are more preferred, and especially ITO particles or tungsten oxide particles are preferred. In particular, since the heat ray shielding function is high and the particles are readily available, tin-doped indium oxide particles (ITO particles) are preferred, and tungsten oxide particles are also preferred.

[00130] With respect to interlayer film and laminated glass, from the point of view of also enhancing the heat shielding properties thereof, it is preferred that the tungsten oxide particles be metal-doped tungsten oxide particles. Examples of "tungsten oxide particles" include metal-doped tungsten oxide particles. Specifically, examples of the metal-doped tungsten oxide particles include sodium-doped tungsten oxide particles, cesium-doped tungsten oxide particles, thallium-doped tungsten oxide particles, rubidium-doped tungsten oxide particles. , and the like.

[00131] With respect to interlayer film and laminated glass, from the point of view of also enhancing the heat shielding properties thereof, cesium-doped tungsten oxide particles are especially preferred. With respect to interlayer film and laminated glass, from the point of view of further enhancing the thermal shielding properties thereof, it is preferred that the cesium-doped tungsten oxide particles be represented by tungsten oxide particles by the formula: Cs0.33WO3.

[00132] The average particle diameter of the heat shield particles is preferably 0.01 µm or more, more preferably 0.02 µm or more preferably 0.1 µm or less and more preferably 0.05 µm or less. When the average particle diameter is the lower limit above or more the heat ray shielding properties are sufficiently increased. When the average particle diameter is the upper limit above or less, the dispersibility of heat shield particles is enhanced.

[00133] The "average particle diameter" refers to the volume average particle diameter. The average particle diameter can be measured using a particle size distribution measurement engine ("UPA-EX150" available from NIKKISO CO., LTD.), or the like.

[00134] In 100% by weight of a layer containing the heat shield particles (a first layer, a second layer or a third layer), each content of the heat shield particles is preferably 0.01% by weight or more, more preferably 0.1% by weight or more, even more preferably 1% by weight or more, especially preferably 1.5% by weight or more, preferably 6% by weight or less, more preferably 5.5% by weight or less, even more preferably 4% by weight or less, especially preferably 3.5% by weight or less and preferably 3% by weight or less. When the content of the heat shield particles is the lower limit above or more, and the upper limit above or below, the heat shield properties are sufficiently enhanced and the visible light transmittance is sufficiently increased.

(metal salt)

[00135] It is preferred that the interlayer film includes at least one type of metal salt (hereinafter sometimes described as Metal M salt) between an alkali metal salt and an alkaline earth metal salt. It is preferred that the first layer contains the Metal M salt. It is preferred that the second layer contains the Metal M salt. It is preferred that the third layer contains the Metal M salt. By using the Metal M salt, control of the adhesion between the interlayer film and a laminating glass member or the adhesion between the respective layers on the interlayer film is facilitated. One type of Metal M salt can be used alone, and two or more types of it can be used in combination.

[00136] It is preferred that the Metal M salt contains at least one type of metal selected from the group consisting of Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba. It is preferred that the metal salt included in the interlayer film contains at least one type of metal between K and Mg.

[00137] Furthermore, it is more preferred that the Metal M salt is an alkali metal salt of an organic acid having 2 to 16 carbon atoms or an alkaline earth metal salt of an organic acid having 2 to 16 carbon atoms , and it is also preferred that the Metal M salt is a magnesium carboxylate of 2 to 16 carbon atoms or a potassium carboxylate of 2 to 16 carbon atoms.

[00138] While magnesium carboxylate having 2 to 16 carbon atoms and potassium carboxylate having 2 to 16 carbon atoms are not particularly limited, examples thereof include magnesium acetate, potassium acetate, magnesium propionate, propionate potassium, magnesium 2-ethylbutyrate, potassium 2-ethylbutanoate, magnesium 2-ethylhexanoate, potassium 2-ethylhexanoate, and the like.

[00139] The total of Mg and K contents in a layer containing the Metal M salt (a first layer, a second layer or a third layer) is preferably 5 ppm or more, more preferably 10 ppm or more, even more preferably 20 ppm or more preferably 300 ppm or less, more preferably 250 ppm or less and even more preferably 200 ppm or less. When the total of the Mg and K contents is the lower limit above or more, and the upper limit above or below, the adhesion between the interlayer film and a laminated glass member or the adhesion between the respective layers in the film interlayer can also be well controlled. (Ultraviolet ray evaluation agent)

[00140] It is preferred that the interlayer film includes an ultraviolet ray evaluating agent. It is preferred that the first layer contain an ultraviolet ray evaluating agent. It is preferred that the second layer contain an ultraviolet ray evaluating agent. It is preferred that the third layer contain an ultraviolet ray evaluating agent. By using an ultraviolet ray evaluating agent, even when the interlayer film and laminated glass are used for a long period of time, the visible light transmittance is also difficult to decrease. One type of the ultraviolet ray evaluating agent can be used alone, and two or more types of the same can be used in combination.

[00141] Examples of the ultraviolet ray evaluating agent include an ultraviolet ray absorber. It is preferred that the ultraviolet ray evaluating agent is an ultraviolet ray absorber.

[00142] Examples of the ultraviolet ray evaluating agent include an ultraviolet ray evaluating agent that contains a metal atom, an ultraviolet ray evaluating agent that contains a metal oxide, an ultraviolet ray evaluating agent that has a benzotriazole structure, an ultraviolet ray evaluating agent having a benzophenone structure, an ultraviolet ray evaluating agent having a triazine structure, an ultraviolet ray evaluating agent having a malonic acid ester structure, a ultraviolet ray evaluating agent having an oxanilide structure, an ultraviolet ray evaluating agent having a benzoate structure, and the like.

[00143] Examples of the ultraviolet ray evaluating agent that contains a metal atom include platinum particles, particles in which the surface of platinum particles is coated with silica, palladium particles, particles in which the surface of palladium particles is coated with silica, and the like. It is preferred that the ultraviolet ray evaluating agent is not heat shielding particles.

[00144] The ultraviolet ray evaluating agent is preferably an ultraviolet ray evaluating agent having a benzotriazole structure, an ultraviolet ray evaluating agent having a benzophenone structure, an ultraviolet ray evaluating agent having a triazine structure or an ultraviolet ray evaluating agent having a benzoate structure, more preferably an ultraviolet ray evaluating agent having a benzotriazole structure or an ultraviolet ray evaluating agent having a benzophenone structure, and further more preferably an ultraviolet ray evaluating agent having a benzotriazole structure.

[00145] Examples of the ultraviolet ray evaluating agent that contains a metal oxide include zinc oxide, titanium oxide, cerium oxide, and the like. Furthermore, with respect to the ultraviolet ray evaluating agent which contains a metal oxide, the surface thereof can be coated with any material. Examples of the coating material for the surface of the ultraviolet ray evaluating agent that contains a metal oxide include an insulating metal oxide, a hydrolysable organosilicon compound, a silicon compound, and the like.

[00146] Examples of the ultraviolet ray evaluator having a benzotriazole backbone include ultraviolet ray assessment agent having a benzotriazole backbone such as 2-(2'-hydroxy-5'-methylphenyl)benzotriazole ("Tinuvin P " available from BASF Japan Ltd.), 2-(2'-hydroxy-3',5'-di-t-butylphenyl)benzotriazole ("Tinuvin 320" available from BASF Japan Ltd.), 2-(2'-hydroxy -3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole ("Tinuvin 326" available from BASF Japan Ltd.) and 2-(2'-hydroxy-3',5'-di-amylphenyl)benzotriazole (" Tinuvin 328" available from BASF Japan Ltd.). It is preferred that the ultraviolet ray evaluating agent is an ultraviolet ray evaluating agent having a benzotriazole structure that contains a halogen atom, and it is more preferred that the ultraviolet ray evaluating agent is an ultraviolet ray evaluating agent. ultraviolet ray which has a benzotriazole structure that contains a chlorine atom, because these are excellent in ultraviolet ray absorption performance.

[00147] Examples of the ultraviolet ray evaluating agent having a benzophenone structure include octabenzone ("Chimassorb 81" available from BASF Japan Ltd.), and the like.

[00148] Examples of the ultraviolet ray evaluating agent having a triazine structure include "LA-F70" available from ADEKA CORPORATION, 2-(4,6-diphenyl-1,3,5-triazine-2-yl)- 5-[(hexyl)oxy]-phenol ("Tinuvin 1577FF" available from BASF Japan Ltd.), and the like.

[00149] Examples of the ultraviolet ray evaluating agent having a malonic acid ester structure include dimethyl(p-methoxybenzylidene)malonate, tetraethyl-2,2-(1,4-phenylenedimethylidene)bismalonate, 2-(p-methoxybenzylidene) )-bis(1,2,2,6,6-pentamethyl-4-piperidinyl)malonate, and the like.

[00150] Examples of a commercial ultraviolet ray evaluation agent product that has a malonic acid ester structure include Hostavin B-CAP, Hostavin PR-25 and Hostavin PR-31 (any of these are available from Clariant Japan K.K.) .

[00151] Examples of the ultraviolet ray evaluating agent that has an oxanilide backbone include a type of oxalic acid diamide that has a substituted aryl group and the like on the nitrogen atom such as N-(2-ethylphenyl)-acid diamide. N'-(2-ethoxy-5-t-butylphenyl)oxalic, N-(2-ethylphenyl)-N'-(2-ethoxy-phenyl)oxalic acid diamide and 2-ethyl-2'-ethoxy-oxanilide ( "Sanduvor VSU" made available by Clariant Japan K.K.).

[00152] Examples of the ultraviolet ray evaluating agent having a benzoate structure include 2,4-di-tert-butylphenyl-3,5-di-tert-butyl-4-hydroxybenzoate ("Tinuvin 120" available from BASF Japan Ltd.), and the like.

[00153] From the point of view of also suppressing the reduction in visible light transmittance after the lapse of a certain period of time, by 100% by weight of a layer containing the ultraviolet ray evaluation agent (a first layer, a second layer or a third layer), the content of the ultraviolet ray evaluating agent is preferably 0.1% by weight or more, more preferably 0.2% by weight or more, even more preferably 0.3% by weight or more, especially preferably 0.5% by weight or more, preferably 2.5% by weight or less, more preferably 2% by weight or less, even more preferably 1% by weight or less and especially preferably 0.8% by weight or less. In particular, by setting the content of the ultraviolet ray evaluating agent to be 0.2% by weight or more in 100% by weight of a layer containing the ultraviolet ray evaluating agent, with respect to the interlayer film and glass laminate, the reduction in visible light transmittance thereof after the lapse of a certain period of time can be significantly suppressed.

(Oxidation inhibitor)

[00154] It is preferred that the interlayer film includes an oxidation inhibitor. It is preferred that the first layer contain an oxidation inhibitor. It is preferred that the second layer contain an oxidation inhibitor. It is preferred that the third layer contain an oxidation inhibitor. One type of oxidation inhibitor may be used alone, and two or more types of the same may be used in combination.

[00155] Examples of the oxidation inhibitor include a phenol-based oxidation inhibitor, a sulfur-based oxidation inhibitor, a phosphorus-based oxidation inhibitor, and the like. The phenol-based oxidation inhibitor is an oxidation inhibitor having a phenol backbone. The sulfur-based oxidation inhibitor is an oxidation inhibitor that contains a sulfur atom. Phosphorus-based oxidation inhibitor is an oxidation inhibitor that contains a phosphorus atom.

[00156] It is preferred that the oxidation inhibitor is a phenol-based oxidation inhibitor or a phosphorus-based oxidation inhibitor.

[00157] Examples of the phenol-based oxidation inhibitor include 2,6-di-t-butyl-p-cresol (BHT), butylated hydroxyanisole (BHA), 2,6-di-t-butyl-4-ethylphenol, β-(3,5-di-t-butyl-4-hydroxyphenyl)propionate, 2,2'-methylenebis-(4-methyl-6-butylphenol), 2,2'-methylenebis-(4-ethyl-6) stearyl -t-butylphenol), 4,4'-butylidene-bis-(3-methyl-6-t-butylphenol), 1,1,3-tris-(2-methylhydroxy-5-t-butylphenyl)butane, tetracis[methylene-3-(3',5'-butyl-4-hydroxyphenyl)propionate]methane, 1,3,3-tris-(2-methyl-4-hydroxy-5-t-butylphenol)butane, 1, 3,5-trimethyl-2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)benzene, bis(3,3'-t-butylphenol)butyric acid glycol ester, bis (3-t-butyl-4-hydroxy-5-methylbenzenepropanoic)ethylenebis(oxyethylene), and the like. One type or two or more types among these oxidation inhibitors are suitably used.

[00158] Examples of the phosphorus-based oxidation inhibitor include tridecyl phosphite, tris(tridecyl) phosphite, triphenyl phosphite, trinonylphenyl phosphite, bis(tridecyl)pentaerythritol diphosphite, bis(decyl)pentaerythritol diphosphite, tris(2,4) -di-t-butylphenyl)phosphite, bis(2,4-di-t-butyl-6-methylphenyl)ethyl ester phosphorous acid, tris(2,4-di-t-butylphenyl)phosphite, 2,2' -methylenebis(4,6-di-t-butyl-1-phenyloxy)(2-ethylhexyloxy)phosphorus, and the like. One type or two or more types among these oxidation inhibitors are suitably used.

[00159] Examples of a commercial oxidation inhibitor product include "IRGAFOS 245" available from BASF Japan Ltd., "IRGAFOS 168" available from BASF Japan Ltd., "IRGAFOS 38" available from BASF Japan Ltd., "Sumilizer BHT" available from Sumitomo Chemical Co., Ltd., "IRGANOX 1010" available from BASF Japan Ltd., and the like.

[00160] With respect to the interlayer film and laminated glass to maintain the high transmittance of visible light thereof over a long period of time, it is preferred that the content of the oxidation inhibitor be 0.1% by weight or more in 100 % by weight of the interlayer film or 100% by weight of the layer containing the oxidation inhibitor (a first layer, a second layer or a third layer). Furthermore, since a commensurate effect with the addition of an oxidation inhibitor is not achieved, it is preferred that the content of the oxidation inhibitor be 2% by weight or less in 100% by weight of the interlayer film or in 100 % by weight of the layer containing the oxidation inhibitor.

(Other ingredients)

[00161] Each of the first layer, the second layer and the third layer may contain additives such as a coupling agent containing silicon, aluminum or titanium, dispersing agent, a surfactant, a flame retardant, an antistatic agent, a pigment, a dye, an adhesive force regulating agent, a moisture resistance enhancing agent, a fluorescent brightening agent and an infrared ray absorber, as required. One type of these additives may be used alone, and two or more types of the same may be used in combination. (Other details of interlayer film for laminated glass)

[00162] From the point of view of enhancing the rigidity of laminated glass and effectively increasing the production efficiency of laminated glass, the softening point of the first layer is 60°C or more. From the viewpoints of also enhancing the rigidity of the interlayer film and effectively increasing the production efficiency of laminated glass in which a gap is suppressed, the softening point of the first layer is preferably 61.5°C or higher. , more preferably 62.5°C or more, even more preferably 64°C or more, even more preferably 65°C or more, even more preferably 66°C or more and especially preferably 70°C or more. From the viewpoints of also enhancing the rigidity of the interlayer film and effectively increasing the production efficiency of laminated glass in which a gap is suppressed, the softening point of the third layer is preferably 58 °C or more. , more preferably 60°C or more, even more preferably 61.5°C or more, even more preferably 62.5°C or more, even more preferably 64°C or more, even more preferably 65°C or more , even more preferably 66°C or more and preferably 70°C or more. The upper limit of the softening point of each of the first layer and the third layer is not particularly limited. The softening point of each of the first layer and the third layer is preferably 80°C or less, more preferably 78°C or less, even more preferably 76°C or less and especially preferably 75°C or less.

[00163] From the point of view of also enhancing the rigidity of laminated glass and effectively increasing the production efficiency of laminated glass, the glass transition temperature of each of the first layer and the third layer is preferably 31°C or more, more preferably 35°C or more and even more preferably 38°C or more. The upper limit of the glass transition temperature of each of the first layer and the third layer is not particularly limited. The glass transition temperature of each of the first layer and the third layer is preferably 48°C or less and more preferably 46°C or less.

[00164] The softening point and glass transition temperature are measured as follows.

[00165] The obtained interlayer film is stored for 1 month or more or 1 month at a temperature of 23°C and a humidity of 30%, after which, when the interlayer film is a multilayer interlayer film, each of the first layer and the third layer is peeled to be insulated and press molded with a press molding machine to obtain an object to be measured. And with respect to the object to be measured, the measurement is performed using "ARES-G2" made available by TA Instruments Japan Inc. In this context, when the interlayer film is a single layer interlayer film, the interlayer film is cut so that it has a diameter of 8 mm to be measured. A parallel plate with a diameter of 8 mm is used as a template, and the measurement is carried out under the condition that the temperature is decreased from 100 °C to -10 °C at a temperature decrease rate of 3 °C. /minute and under the condition of a frequency of 1 Hz and a voltage of 1%. In the measurement results obtained, the peak temperature of the loss tangent is defined as the glass transition temperature Tg (°C). The temperature at which a loss tangent value in a temperature region between 100 °C and Tg (°C) becomes minimum is defined as the softening point. Although the period for storing the obtained interlayer film at a temperature of 23°C and a humidity of 30% is not particularly limited, as long as the period is a month or more, it is preferred that the period is a month. Furthermore, although the thickness of an object to be measured is not particularly limited, for example, it is preferred that the thickness is within the range of 300 to 800 μm.

[00166] The thickness of the interlayer film is not particularly limited. From a practical point of view and from the point of view of sufficiently enhancing the penetration resistance of laminated glass, the thickness of the interlayer film is preferably 0.1 mm or more, more preferably 0.25 mm or more preferably 3 mm or less and more preferably 1.5 mm or less. When the thickness of the interlayer film is the lower limit above or more, the penetration resistance of laminated glass is enhanced. When the thickness of the interlayer film is the upper limit above or less, the transparency of the interlayer film is also improved.

[00167] It is preferred that the interlayer film is obtained by melt extrusion molding.

[00168] The production method of the interlayer film is not particularly limited. In the case of a single layer interlayer film, examples of the method of producing the interlayer film include a method of extruding a resin composition with an extruder. In the case of a multilayer interlayer film, examples of the method of producing the interlayer film include a method of separately forming the respective resin compositions used to form the respective layers into the respective layers, and then, for example, layering the respective layers obtained, a method of co-extruding the respective resin compositions used to form the respective layers with an extruder and layering the respective layers, and the like. An extrusion molding production method is preferred, because the method is suitable for continuous production.

[00169] As the production efficiency of the interlayer film is excellent, it is preferred that the respective polyvinyl acetal resins contained in the first layer and the third layer are equal to each other, it is more preferred that the respective polyvinyl acetal resins contained in the The first layer and the third layer are the same as each other and the respective plasticizers contained herein are the same as each other, and it is also preferred that the first layer and the third layer are formed from the same resin composition as each other. Furthermore, the sectional shape of the interlayer film can be a rectangular shape and it can be a wedge-like shape.

[00170] It is preferred that an embossed pattern be imparted to a surface of the interlayer film. When the softening point of the outer surface portion of the interlayer film is high, there is a case where it is difficult to carry out an embossing process and there is a case where an embossed pattern is not collapsed in the laminated glass production process and this way bubbles are generated inside the laminated glass. However, by properly adjusting the temperature of the interlayer film, the applied pressure or the temperature of an embossed roller when embossing it, an appropriate embossing pattern can be imparted to it. Furthermore, when the softening point of the outer surface portion of the interlayer film is high, although there is a problem that the friction between the two interlayer films or between the interlayer film and a glass plate becomes difficult to be generated, the above-mentioned problem can be solved by giving an appropriate embossed pattern to it.

(Laminated glass)

[00171] Fig. 3 is a sectional view schematically showing an example of laminated glass prepared with the interlayer film for the laminated glass shown in Fig. 1.

[00172] Laminated glass 31 shown in Fig. 3, a first laminated glass member 21, a second laminated glass member 22 and an interlayer film 11 are provided. The interlayer film 11 is disposed between the first laminated glass member 21 and the second laminated member. laminating glass 22 to be sandwiched therebetween.

[00173] The first laminated glass member 21 is layered onto a first surface 11a of the interlayer film 11. The second laminated glass member 22 is layered onto a second surface 11b opposite the first surface 11a of the interlayer film 11. The first laminated glass member 21 is layered onto an external surface 1a of a first layer 1. The second laminated glass member 22 is layered onto an external surface 3a of a first layer 1. third layer 3.

[00174] Fig. 4 is a sectional view schematically showing an example of laminated glass prepared with the interlayer film for the laminated glass shown in Fig. two.

[00175] Laminated glass 31A shown in Fig. 4 is provided with a first laminated glass member 21, a second laminated glass member 22 and an interlayer film 11A. The interlayer film 11A is disposed between the first laminated glass member 21 and the second laminated glass member 22 to be sandwiched therebetween.

[00176] The first lamination glass member 21 is layered onto a first surface 11a of the interlayer film 11A. The second laminated glass member 22 is layered onto a second surface 11b opposite the first surface 11a of the interlayer film 11A.

[00177] As described above, for laminated glass there is provided a first laminated glass member, a second laminated glass member and an interlayer film, and the interlayer film is the interlayer film for laminated glass in accordance with the present invention. In laminated glass, the aforementioned interlayer film is disposed between the first lamination glass member and the second lamination glass member.

[00178] Examples of the lamination glass member include a glass plate, a PET (polyethylene terephthalate) film, and the like. Like laminated glass, laminated glass in which an interlayer film is sandwiched between a glass plate and a PET film or the like, as well as laminated glass in which an interlayer film is sandwiched between two glass plates, is included . Laminated glass is a laminate provided with a glass plate, and it is preferred that at least one glass plate is used. It is preferred that each of the first laminating glass member and the second laminating glass member is a glass plate or a PET film, and the laminated glass is provided with a glass plate as at least one of the first laminating glass member and the second laminating glass member. It is preferred that also the first laminated glass member and the second laminated glass member are glass plates (a first glass plate and a second glass plate). The interlayer film is disposed between a first glass plate and a second glass plate to properly obtain laminated glass.

[00179] Examples of the glass plate include an inorganic glass sheet and an organic glass sheet. Examples of the inorganic glass include float plate glass, heat ray absorbing plate glass, heat ray reflecting plate glass, polished plate glass, figured glass, bonded plate glass, and the like. Organic glass is synthetic resin glass replaced by inorganic glass. Examples of the organic glass include a polycarbonate plate, a poly(meth)acrylic resin plate, and the like. Examples of the poly(meth)acrylic resin board include a polymethyl(meth)acrylate board, and the like.

[00180] The thickness of the lamination glass member is preferably 1 mm or more, preferably 5 mm or less, more preferably 3 mm or less and even more preferably 1.8 mm or less. Furthermore, when the laminating glass member is a glass plate, the thickness of the glass plate is preferably 0.5 mm or more, more preferably 0.7 mm or more preferably 5 mm or less and more preferably 3 mm or more. any less. When the laminating glass member is a PET film, the densities of the PET film are preferably 0.03 mm or more and preferably 0.5 mm or less. Although the lamination glass member can be a flat sheet of glass and it can be a curved sheet of glass, for example, when the thickness of the lamination glass member is 1.8 mm or less, the stiffness of the laminated glass it can be enhanced using the curved sheet of glass. Furthermore, although there is a case where it is difficult to make an interlayer film with a high softening point set on a curved shape of the curved sheet of glass, imparting an embossed pattern to the interlayer film, it is easy to do so. the interlayer film set into a curved shape of the curved sheet of glass.

[00181] The method for producing laminated glass is not particularly limited. For example, the interlayer film is sandwiched between the first laminated glass member and the second laminated glass member, and then passed through pressure rollers or subjected to decompression suction in a rubber bag, so that remaining air between the first and second laminating glass members and the interlayer film is removed. Subsequently, the members are preliminarily bonded together at approximately 70 to 110 °C to obtain a laminate. Then, by autoclaving the laminate or pressing the laminate, the members are press-bonded together at about 120 to 150 °C and under a pressure of 1 to 1.5 MPa. In this way laminated glass can be obtained. When producing laminated glass, a first layer, a second layer and a third layer can be layered.

[00182] Each of the interlayer film and laminated glass can be used for automobiles, railway vehicles, aircraft, ships, civil construction and the like. Each of the interlayer film and laminated glass can also be used for applications different from these applications. It is preferred that the interlayer film and the laminated glass are an interlayer film and the laminated glass for vehicles or civil construction respectively, and it is more preferred that the interlayer film and the laminated glass are an interlayer film and laminated glass for vehicles respectively. Each of the interlayer film and laminated glass can be used for an automobile windshield, side window, rear window or sunroof, and the like. Interlayer film and laminated glass are suitably used for automobiles. Interlayer film is used to obtain laminated glass for an automobile.

[00183] From the point of view of obtaining laminated glass also excellent in transparency, the visible light transmittance of laminated glass is preferably 65% or more and more preferably 70% or more. The visible light transmittance of laminated glass can be measured in accordance with JIS R3211 (1998). It is preferred that the visible light transmittance of laminated glass obtained by sandwiching the laminated glass interlayer film according to the present invention between two sheets of green glass (heat ray absorbing plate glass) having a thickness of 2 mm according to JIS R3208 is 70% or more. Visible light transmittance is more preferably 75% or more.

[00184] Next, the present invention will be described in more detail with reference to the examples. The present invention is not limited to these examples only.

(Polyvinyl Acetal Resin)

[00185] The polyvinyl acetal resin shown in the following Tables 1 to 4 was properly used. In all polyvinyl acetal resins used, n-butyraldehyde having 4 carbon atoms is used for acetalization.

[00186] With respect to polyvinyl acetal resin, the degree of acetalization (the degree of butyralization), the degree of acetylation and the hydroxyl group content were measured by a method according to JIS K6728 "Testing methods for polyvinyl butyral ". In this context, even in cases of being measured according to ASTM D1396-92, numerical values similar to those obtained by a method according to JIS K6728 "Testing methods for polyvinyl butyral" were displayed. (Plasticizer)

[00187] Triethylene glycol di-2-ethyl hexanoate (3GO) (Charge)

[00188] Type (1) (described as (1) in the following table): Nipgel AZ201 (silica particles, available from TOSOH SILICA CORPORATION, the specific surface area by the BET method of 300 m2/g)

[00189] Type (2) (described as (2) in the following table): AEROSIL 380 (silica particles, available from NIPPON AEROSIL CO., LTD., the specific surface area by the BET method of 380±30 m2/ g)

[00190] Type (3) (described as (3) in the following table): Nipgel AZ204 (silica particles, available from TOSOH SILICA CORPORATION, the specific surface area by the BET method of 300 m2/g)

[00191] Type (4) (described as (4) in the following table): SYLYSIA 310P (silica particles, available from FUJI SILYSIA SUBSTÂNCIA QUÍMICA LTD., the specific surface area by the BET method of 300 m2/g) ( ultraviolet ray evaluation agent)

[00192] Tinuvin 326 (2-(2'-hydroxy-3'-t-butyl-5-methylphenyl)-5-chlorobenzotriazole, "Tinuvin 326" available from BASF Japan Ltd.) (Oxidation inhibitor)

[00193] BHT (2,6-di-t-butyl-p-cresol)

(Example 1)

[00194] One hundred parts by weight of a polyvinyl acetal resin of a type shown in Table 1 below, 31 parts by weight of a plasticizer (3GO), 0.2 part by weight of an ultraviolet ray evaluating agent (Tinuvin 326 ) and 0.2 part by weight of an oxidation inhibitor (BHT) were mixed to obtain a composition to form a first layer and a third layer. Composition preparation to form the second layer:

[00195] One hundred parts by weight of a polyvinyl acetal resin of a type shown in Table 1 below, 60 parts by weight of a plasticizer (3GO), 20 parts by weight of a filler type (Nipgel AZ201), 0.2 part by weight of an ultraviolet ray evaluating agent (Tinuvin 326) and 0.2 part by weight of an oxidation inhibitor (BHT) were mixed to obtain a composition to form a second layer. Interlayer film preparation:

[00196] Through co-extrusion of the composition to form a first layer and a third layer and of the composition to form a second layer using a co-extruder, an interlayer film (780 μm in thickness) having an extended layered structure with a stack of a first layer (340 μm in thickness)/a second layer (100 μm in thickness)/a third layer (340 μm in thickness) was prepared.

[00197] In this context, the coextrusion condition was as follows. The distance between a mold outlet used in the co-extruder and a contact point on the first roll closest to the mold, the linear speed of an interlayer film between the mold exit and the first roll, and the temperature of the interlayer film were adjusted to be 12 cm, 0.6 m/minute and 175°C, respectively. The temperature of the interlayer film was lowered to 25°C by passing the interlayer film through the first roll and a second roll (a chill roll). In addition, the temperature of the interlayer film was adjusted to be 90°C by passing the interlayer film through a third roll (a temperature adjustment roll) and the interlayer film being passed through a fourth roll. (for example, an embossed pattern forming roller) whose temperature is set to 135°C. The speed ratio of the fourth roll to the third roll was set to 1.45 times. After it was passed through the fourth roll, the temperature of the interlayer film was adjusted to 25°C by passing the interlayer film through a fifth roll (a cooling roll) after the interlayer film was wrapped around a core at a linear speed of 0.9 m/minute. In this context, before an interlayer film is wound around a core, both ends in the TD direction were cut from an interlayer film with a length in the TD direction of 150 cm so that the respective 25 cm portions of both ends were removed, and an interlayer film with a length in the TD direction of 100 cm was wound around a core. (Examples 2 to 4)

[00198] An interlayer film was prepared in the same manner as that in Example 1 except that the type of ingredients to be mixed and the amount of mixing thereof for the composition to form a first layer and a third layer and the composition to form a second layer and the thicknesses of a first layer, a second layer and a third layer have been adjusted to those listed in Table 1 below, and further, the thicknesses of a first layer, a second layer and a third layer have been adjusted adjusted to those listed in Table 1 below. (Comparative Example 1)

[00199] An interlayer film was obtained under the same condition as that in Example 1 unless the temperature of an interlayer film was set to be 100°C when the interlayer film was passed through the third roll and the speed ratio of the fourth roll to the third roll was set at 1.48 times. (Examples 5 to 15 and 21 to 26)

[00200] An interlayer film was prepared in the same manner as that in Example 1 except that the type of ingredients to be mixed and the amount of mixing thereof for the composition to form a first layer and a third layer and the composition to form a second layer and the thicknesses of a first layer, a second layer and a third layer have been adjusted to those listed in the following Tables 2 to 4. In this context, the coextrusion condition is the same as in Example 1. (Examples 16 to 20)

[00201] The type of ingredients to be mixed and the amount of mixing thereof for the composition to form a first layer and a third layer and the composition to form a second layer were adjusted to those listed in the following Tables 3 to 4 for preparing compositions to prepare an interlayer film.

[00202] In this context, the coextrusion condition was as follows, and interlayer films in which the thicknesses of a first layer, a second layer and a third layer were adjusted to those listed in the following Tables 3 to 4 were prepared. The distance between a mold outlet used in the co-extruder and a contact point on the first roll closest to the mold, the linear speed of an interlayer film between the mold exit and the first roll, and the temperature of the interlayer film were adjusted to be 12 cm, 0.6 m/minute and 175°C, respectively. The temperature of the interlayer film was lowered to 25°C by passing the interlayer film through the first roll and a second roll (a chill roll). In addition, the temperature of the interlayer film was adjusted to be 90°C by passing the interlayer film through a third roll (a temperature adjustment roll) and the interlayer film being passed through a fourth roll. (for example, an embossed pattern forming roller) whose temperature is set to 135°C. The speed ratio of the fourth roll to the third roll was set to 1.2 times. After it was passed through the fourth roll, the temperature of the interlayer film was adjusted to 25°C by passing the interlayer film through a fifth roll (a cooling roll) after the interlayer film was annealed for 2 minutes. at 110°C after it was passed through the fifth roll. The interlayer film was wound around a core at a linear speed of 0.7 m/minute. In this context, before an interlayer film is wound around a core, both ends in the TD direction were cut from an interlayer film with a length in the TD direction of 150 cm so that the respective 25 cm portions of both ends were removed, and an interlayer film with a length in the TD direction of 100 cm was wound around a core.

[00203] In this context, in Tables 1 to 4, the description of the contents of the ultraviolet ray evaluation agent and the oxidation inhibitor was omitted. In Examples 2 to 26 and Comparative Example 1, each of the ultraviolet ray evaluating agent and the oxidation inhibitor of the same type as that in Example 1 was mixed in an amount of 0.2 parts by weight relative to 100 parts by weight. weight of polyvinyl acetal resin in a composition to form a first layer and a third layer, and each of the ultraviolet ray evaluating agent and the oxidation inhibitor of the same type as that in Example 1 was mixed in an amount of 0 .2 parts by weight relative to 100 parts by weight of the polyvinyl acetal resin in a composition to form a second layer. (Evaluation) (1) Softening point and glass transition temperature

[00204] The obtained interlayer film was stored for 1 month at a temperature of 23 °C and a humidity of 30%, after which each of the surface layers (the first layer and the third layer) was peeled to be isolated and press molded with a press molding machine to obtain an object to be measured.

[00205] And with respect to the object to be measured, the measurement was performed using "ARES-G2" made available by TA Instruments Japan Inc. A parallel plate with a diameter of 8 mm was used as a template, and the measurement was performed under the condition in which the temperature is decreased from 100 °C to -10 °C at a temperature decrease rate of 3 °C. /minute and under the condition of a frequency of 1 Hz and a voltage of 1%. In the measurement results obtained, the peak temperature of the loss tangent was defined as the glass transition temperature Tg (°C). Furthermore, the temperature at which a loss tangent value in a temperature region between 100 °C and Tg (°C) becomes minimum was defined as the softening point. In this context, even when the thickness of an object to be measured was controlled to 800 μm at the time of press molding the insulated surface layer with a press molding machine, similar results were obtained. (2) Thermal shrinkage ratio

[00206] By the method described above, an A1 interlayer film (a test specimen) as a 5 cm square section which is a portion at a distance of 0.05X from one end in the TD direction inward, a A2 interlayer film (a test specimen) as a 5 cm square section which is a portion at a distance of 0.05X from the other end in the TD direction inward, and an A3 interlayer film (a specimen of test) as a 5 cm square section which is a portion at a distance of 0.5X from each of one end and the other end in the TD direction of the interlayer film inward were obtained, and measured for the ratio of thermal contraction by the method described above. (3) End cutting performance

[00207] The obtained interlayer film was cut from one end to the other in the TD direction so that the length in the MD direction of the interlayer film becomes 20 cm to obtain an interlayer film B. The interlayer film B was laid horizontally on a mesh shelf in order not to suppress the dimensional change of the interlayer B film, and its humidity control was carried out for 2 days at 23 °C and 30% RH. Subsequently, from the moisture controlled interlayer film B, an interlayer film B1 (a test specimen) as a 5 cm square section, which is a portion at a distance of 0.5X from each end and the another end in the TD direction of the interlayer film inwards was obtained. A B1 interlayer film was positioned so that a line segment at a distance of 0.5X from each end and the other end in the TD direction of the interlayer film inward was superimposed with the centerline of the interlayer film. interlayer B1 to obtain the interlayer film B1 with a square shape of 15 cm square. On a fluororesin sheet ("Article number 7-363" available from COMO ONE Corporation, 5 mm in thickness) preheated for 20 minutes in a hot air dryer at 140 °C, the B1 interlayer film was laid horizontally without being fixed. , and the B1 interlayer film was heated for 20 minutes at 140°C. The heated B1 interlayer film was subjected to perforation with a super dumbbell cutter: SDBK-1000-T made available by CO. by DUMBBELL, LTD. To get three pieces of test specimens. The test specimens obtained were stored for 12 hours at 23°C and 30% RH. Subsequently, using TENSILON available from A&D Company, Limited at a constant ambient temperature of 25 °C, a test specimen was vertically (up and down) ruptured at a movement speed of 200 mm/min to perform a tear test. ment for the test specimen. The maximum value of a load obtained in the period leading up to breakage was read, and the interlayer film was evaluated for edge cutting performance based on an average value (maximum tear load value) as a result. obtained from three pieces of test specimens. In this context, at the time of allowing a test specimen to be vertically (up and down) ruptured, the vertical direction (upward direction) and MD direction were made to coincide with each other and the test was performed. In this context, even when the vertical (upward and downward) direction and the TD direction were made to coincide with each other when allowing a test specimen to be vertically (upward and downward) ruptured and the test was performed, similar results were obtained.

EXPLICAÇÃO DE SÍMBOLOS 1: Primeira camada 1a: Superfície externa 2: Segunda camada 2a: Primeira superfície 2b: Segunda superfície 3: Terceira camada 3a: Superfície externa 11, 11A: Película de intercamada 11a: Primeira superfície 11b: Segunda superfície 21: Primeiro membro do vidro de laminação 22: Segundo membro do vidro de laminação 31, 31A: Vidro laminado[00208] The details and results are shown in the following Tables 1 to 4. In this context, in the following Tables 1 to 4, the description of the ingredients to be mixed other than the polyvinyl acetal resin, the plasticizer and the filler has been omitted .

EXPLANATION OF SYMBOLS 1: First layer 1a: Outer surface 2: Second layer 2a: First surface 2b: Second surface 3: Third layer 3a: Outer surface 11, 11A: Interlayer film 11a: First surface 11b: Second surface 21: First member of laminated glass 22: Second member of laminated glass 31, 31A: Laminated glass

Claims (13)

1. Interlayer film for laminated glass having a one-layer structure or a two- or more-layer structure, characterized in that it comprises a first layer containing a thermoplastic resin, the thermoplastic resin in the first layer being a polyvinyl acetal resin, the softening point of the first layer being 60°C or more, the interlayer film having an MD direction and a TD direction, and with respect to the thermal shrinkage ratios obtained when the following first inner portion, the following second inner portion and the following central portion are heated for 20 minutes at 140°C respectively, the entire following MD1MAX thermal shrink ratio, the following MD2MAX thermal shrink ratio and the following MD3MAX thermal shrink ratio being 45% or less. a first inner portion: being represented as a 5 cm square section which is a portion at a distance of 0.05X from one end in the TD direction to the interior of the interlayer film when a distance between one end and the other end in the TD direction TD of the interlayer film is defined as X a second inner portion: being represented as a 5 cm square section which is a portion at a distance of 0.05X from the other end in the TD direction to the interior of the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X a central portion: being represented as a 5 cm square section which is a portion at a distance of 0.5X from each of one end and the other end in the TD direction into the interlayer film when a distance between one end and the other end in the TD direction of the interlayer film is defined as X a re MD1MAX thermal shrink ratio and an MD1MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a lower side thermal shrink ratio to thermal shrink ratio respectively being defined as MD1MAX and MD1MIN in the case where two sides parallel to the MD direction of the first inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side respectively being defined as MD1MAX and MD1MIN in the case where two sides parallel to the MD direction of the first inner portion are the same in thermal shrink ratio an MD2MAX thermal shrink ratio and a MD2MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a MD2MIN thermal shrink ratio shrinkage of a lower side in relation to thermal shrinkage respectively being defined as MD2MAX and MD2MIN in the case where two sides parallel to the MD direction of the second inner portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio on one side and a thermal shrinkage ratio on the other side respectively being defined as MD2MAX and MD2MIN in the case where two sides parallel to the MD direction of the second inner portion are the same in thermal shrink ratio an MD3MAX thermal shrink ratio and a MD3MIN thermal shrink ratio: a higher side thermal shrink ratio to thermal shrink ratio and a MD3MIN thermal shrink ratio shrinkage of a lower side to thermal shrinkage ratio respectively being defined as MD3MAX and MD3MIN in the case where two sides parallel to the MD direction of the central portion are different in thermal shrinkage ratio, or a thermal shrinkage ratio of one side and a thermal contraction ratio of the other side respectively being defined as MD3MAX and MD3MIN in the case where two sides parallel those in the MD direction of the central portion are the same in relation to thermal shrinkage 2. Interlayer film for laminated glass according to claim 1, characterized in that the softening point of the first layer is 61.5°C or more. 3. Interlayer film for laminated glass according to claim 1 or 2, characterized in that the glass transition temperature of the first layer is 35°C or more. A laminated glass interlayer film according to any one of claims 1 to 3, characterized in that it also comprises a second layer containing a thermoplastic resin, the first layer being disposed on a first side of the surface of the second layer. 5. Interlayer film for laminated glass according to claim 4, characterized in that the thermoplastic resin in the second layer is a polyvinyl acetal resin. 6. Interlayer film for laminated glass according to claim 5, characterized in that the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is greater by 9.5% in mol or more than the content of the group hydroxyl of the polyvinyl acetal resin in the second layer. 7. Interlayer film for laminated glass according to any one of claims 4 to 6, characterized in that the second layer contains filler. 8. Laminated glass interlayer film according to any one of claims 4 to 7, characterized in that it also comprises a third layer containing a thermoplastic resin, the third layer being arranged on a second side of the surface on the opposite side of the first. second layer surface. 9. Interlayer film for laminated glass according to any one of claims 1 to 8, characterized in that the content of the hydroxyl group of the polyvinyl acetal resin in the first layer is 33% by mol or more. 10. Laminated glass interlayer film according to any one of claims 1 to 9, characterized in that the first layer contains a plasticizer and the plasticizer content in the first layer is 25 parts by weight or more and 35 parts by weight or less with respect to 100 parts by weight of the thermoplastic resin in the first layer. 11. Laminated glass interlayer film according to any one of claims 1 to 10, characterized in that the entire MD1MAX thermal shrinkage ratio, MD2MAX thermal shrinkage ratio and MD3MAX thermal shrinkage ratio are 40% or less . 12. Laminated glass interlayer film according to any one of claims 1 to 11, characterized in that the entire MD1MIN thermal shrinkage ratio, MD2MIN thermal shrinkage ratio and MD3MIN thermal shrinkage ratio are 20% or more . 13. Laminated glass, characterized in that it comprises: a first laminated glass member; a second lamination glass member; and the laminated glass interlayer film as defined in any one of claims 1 to 12, the laminated glass interlayer film being disposed between the first laminated glass member and the second laminated glass member.

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